/Engine/Source/Runtime/CoreUObject/Public/UObject/Class.h
a string representing the combination of set bits in the bitfield or, if not a bitfield/flags enumeration, the string associated with the enumerator for the specified enum value for the enum specified by the template type.
template<typename EnumType, std::enable_if_t<([TIsEnum](API\Runtime\Core\Templates\TIsEnum)< EnumType >::Value), int >> static [FString](API\Runtime\Core\Containers\FString) GetValueOrBitfieldAsString ( const EnumType EnumeratorValue )